Machine fob cutting and dressing stone



uruTEn sTATns PATENT onirica-f.-ff i* i v MIGHILL NUTTING, OF PORTLAND, MAINE.

MACHINE FOR CUTTING AND DRESSING- STONE.

Speccation of Letters Patent No. 195, dated May 15, 1837.

To all whom t may concern.' Y

Be it known that I, MIGHILL NUTTING, of Portland, in the State of Maine, have invented certain Improvements in Machinery `for Cutting, Dressing, Grinding, and Polishing Granite, Marble` and other Kinds of Stone used for Architectural and other Purposes;` and I do hereby declare that the following is a full and exact description thereof.

Inthe accompanying drawing, Figure l is a top view, Fig. 2, a side elevation, and Fig. 3, a longitudinal, vertical section of the machine, and in each of these figures wherever the same parts are shown` they are designated by the same letters of reference.

The frame is marked a, a, a, and for this no particular size can be given, as it may vary from threeq or four, to twenty-five, or thirty, feet in length, and from twoy to ten feet in width, more or less, according to the kind of work it is intended to perform. Within the main frame a, a, a, there is a carriage upon the top `of which, the stone is to rest. On the under side of each of the lower side rails of this carriage, there is a rack, shown at 00, in the section, Fig. 3, into which racks mesh two pinions c, fixed upon a shaft d, which crosses, and runs in suitable bearings on, the lower side of the main frame, and by means of which the carriage is made to traverse back and forth, in a way to be presently described.

The top frame of the carriage b', b, is made to be raised and lowered, for thepurpose of regulating the height of the stone.

In Figs. 2, and 3q f, f, are screws, the upper ends of which enter, and support, the top frame, having their points square, or being otherwise so fixed as to prevent their turning; g, g, are nuts which are to act upon these screws; the lower end of these nuts are hemispherical, and set in cups, or hollows, adapted to them, on the lower rail; their upper sides are formed into bevel wheels, as shown in the drawing, and they are turned by the bevel wheels it, 71 the shafts of which pass through the frame,l and are carried by winches i, z'. One of these screws, and its appendages, is placed at each corner of the frame.

The cutting apparatus, or cuttre frame, is situated on the top of the main frame; j being the driving shaft to which the moving power of any suitable kind may be applied.

1A band a, from the Whirl z, gives morante a cylinder m, carrying'lifters ma, set Vspirally around 1t; these lifters act upontlie ends rof. the hammer levers,`o, 0, 0, and" raise the hammers p, 79, p. In the top view, these hammers are hidden by the springs g, (1, q, which are intended to act upon the hammers with greater, or less, force. These hammers strike upon the heads of chisels r, 1", which slide in suitable sockets, and have on them a pin` or shoulder, which determines the depth to which they may descend; they have also each a bearing by means of a. shoulder, upon a spring s, by which they are raised, and sustained, above the stone, after every stroke of the hammer. springs o, g, are all placed upon a shaft` t, t, which has journals fitted to holes `in the cheeks u, u, of the cutting apparatus, Vor cutter frame, and by means of the set screws o, '2), these springs may, simultaneously, be raised, or lowered, so as to act upon the hammers with a graduated force. The cheeks u, u, which sustain the axes, and the other parts of the cutting apparatus, are aflixed upon the stout axis w, w, whichhas firm bearings upon the main frame; and the whole apparatus, sustained by the cheeks, u, u, is capable of Abeing changed inposition by turning on this axis, so that the chisels The may stand vertically` or have any desired v inclination given to them. The screw braces w, serve to fix this cutting frame, in the required position; fv, o, are Vthe set screws by which the spring shaft t, t, is regulated; and a, a, set screws by which the springs, s, which raise the chisels, are regulated, these springs being also placed upon a shaft` en- 10o within which aprojecting pinupon the axis,

lw, enters, as shown at b2; the axis w, is made of suflicient length to allow of this lateral motion; and the hub a, is made to revolvek by the bevel geared shaft c', which has a d, upon the shaft j, meshes. and shaft, with the endless screw, are shown separately at c, d,in the sectional drawing Fig. 3.

I pinion upon it into which the endless screw This pinion Y* Upon the shaft 7', there is a second endless screw c, which meshes into a pinion f', upon the vertical shaft g', the lower end of `which shaft carries the beveled pinionh,

which meshes into the beveled wheels z", 2, upon the shaft 0l. The lever j, serves toV reverse the motion of the carriage, by changing the gear of the pinion h', with z", or 2, in a manner well known. lVith this cutting' and dressing machine I combine agrnding or polishing cylinder, which, when used, is driven by the same power, and is to voperate'upona stone upon the same carriage as that employed in the process of dressing. `One of'these cylinders is shown at driven bya band Z from the shaft m. The cylindersV may be changed at pleasure, according to the operation which they are to perform, or the grinding,

or polishing material used with them. ToV

these cylinders, it is absolutely necessary to give a longitudinal, vibratory motion; and this I effect by 'cutting right and lefthanded spiral, or screw, grooves upon the cylindrical hub n, upon the axis of the cylinder, which grooves run into each other, as shown in the drawing; o', is a guide piece, revolving on a pin p, in the standard g', and having an edge which fits into the grooves on the hub ;V this guide piece is turned'by the action of the groove, whenever it arrives at the termination of one spiral, the groove vbeing so formed as to produce this effect, and the width ofthe edge of the guide piece being such as to keep it in its proper groove, until turned in the manner described. The effect of this in vibrating the cylinder will be obvious.

I have notsaid anything respecting the form, or size, ofthe chisels, or relating to other minor arrangements which the judicious workman will vary according to circumstances, and which are not, from their nature, reducible' to'any 4fixed rules; but I Vhavefully setfforth the manner in which I as set forth. Y

3.71 claim, likewise, the manner in which I havecomb'ined and arranged the respective partsy ofthe cutter frame, so that the position of the chisels, and of the other parts connected therewith, may be regulated by the turning of the cutter frame upon its axis; and the manner of vibrating this frame by a lateral motion communicated to the said axis.

MIGHILL NUTTING.

Witnesses THos. P. JONES, W. THOMPSON. 

